The effects of cannabis use on a witness's memory do not fall within the categories of potential unreliability in s 31 of the Jury Directions Act 2015 (Vic) requiring an unreliable evidence direction, where the jury can evaluate the potential unreliability from their own knowledge and experience. Full exposure of the issue through cross-examination and closing address constitutes 'good reasons' for not giving such a direction even if the evidence were of a kind that may be unreliable.
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